126666660631 has 16 divisors (see below), whose sum is σ = 152409141760. Its totient is φ = 102838105440.

The previous prime is 126666660619. The next prime is 126666660649. The reversal of 126666660631 is 136066666621.

It is not a de Polignac number, because 126666660631 - 2²¹ = 126664563479 is a prime.

It is a super-2 number, since 2×126666660631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126666660031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656950 + ... + 827596.

It is an arithmetic number, because the mean of its divisors is an integer number (9525571360).

Almost surely, 2^126666660631 is an apocalyptic number.

126666660631 is a deficient number, since it is larger than the sum of its proper divisors (25742481129).

126666660631 is a wasteful number, since it uses less digits than its factorization.

126666660631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176254.

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 126666660631 in words is "one hundred twenty-six billion, six hundred sixty-six million, six hundred sixty thousand, six hundred thirty-one".